Abstract
Free-living parasite infectious stages, such as the cercariae of trematodes (flatworms), can represent substantial biomass in aquatic ecosystems, yet their interactions with other planktonic fauna are poorly understood. Given that cercariae are consumed by various aquatic predators, sometimes even preferentially over zooplankton, their presence may decrease predation pressure on free-living organisms within similar trophic niches by serving as alternate prey. Here, we experimentally examined how the presence of cercariae (Plagiorchis sp.) affected the population dynamics of common freshwater zooplankton (Daphnia sp.) in the presence of a predator (the larval dragonfly, Leucorrhinia intacta) known to consume both. After seeding 48 mesocosms with starting populations of Daphnia, we used four treatments (12 replicates each) representing a factorial combination of the absence/presence of both cercariae and dragonfly larvae and tracked Daphnia populations over 4 weeks. We found a significant interaction between the presence of cercariae and predators on Daphnia population size. When faced with predation pressure, Daphnia reached ~ 50% higher numbers when accompanied by cercariae than without, suggesting a “protective” effect of the latter by acting as substitute prey. Within aquatic ecosystems, an abundance of trematodes may prove advantageous for zooplankton communities that share common predators, but further studies will be needed to determine how this varies depending on the predator, trematode, and zooplankton taxa involved.
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Acknowledgements
We thank L. Santos and J. Nguyen for experimental assistance, as well as S. J. McCauley for advice. This work was supported by an NSERC Discovery grant to J. K. (RGPIN-2015-05566).
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BS and JK conceived and designed the experiments. BS performed the experiments. BS and JK analyzed the data and wrote the manuscript.
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Communicated by Pieter Johnson.
Here we demonstrate that free-living parasite infectious stages interact with other zooplankton and “protect” these by serving as alternative prey, with potentially broad effects of their consumption.
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Schultz, B., Koprivnikar, J. Free-living parasite infectious stages promote zooplankton abundance under the risk of predation. Oecologia 191, 411–420 (2019). https://doi.org/10.1007/s00442-019-04503-z
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DOI: https://doi.org/10.1007/s00442-019-04503-z